Grand jury proceedings are conducted behind closed doors, so the details are unknown, the Globe notes. One official told the Globe that the grand jury in Suffolk County, Mass., is not in a hurry to charge Hernandez because he is being held without bail.

Safiro Furtado and Daniel Abreu, immigrants from Cape Verde, were killed in Boston's South End after a sport utility vehicle with Rhode Island license plates pulled up next to their car and people inside began firing shots.

Boston police reportedly made a connection between the double murder and Hernandez while he was under investigation for the June 17 shooting death of Odin Lloyd.